covers 'facets/enumerable/per'

test_case Enumerable do

  method :per do

    test "map" do
      e = [1,2,3].per.map

      (e + 3).assert == [4,5,6]
      (e - 1).assert == [0,1,2]

      e.to_s.assert == ['1','2','3']
    end

  end

end